Reinforced-plastic molding

SCRIMP process This Seeman Composites Resin Infusion Process (SCRIMP) is described as a gas-assist resin transfer molding process. As an example glass fiber fabrics/ thermoset vinyl ester polyester plastic and polyurethane foam panels (for insulation) are placed in a segmented tool. A vacuum is pulled with a bag so that a huge amount of plastic can be drawn into the mold (Marco process approach). Its curved roof is made separately and bonded to the box with mechanical and adhesive fastening. It is similar to various reinforced plastics molding processes. 

Let us consider the results of physical-mechanical tests of glass-reinforced plastics based on VAK adhesive and of steel specimens with glass-reinforced plastic molded on to them. The tests were performed to model to some extent the types of loads to which such cemented structures are subjected in actual use. 

Near-net-shape configuration n. In reinforced plastics molding, designating a fibrous-preform shape very close to the shape the perform will take after resin impregnation and curing in the mold, such that no lay-up and little or no trimming after molding are required. 

Wet layup In the reinforced plastics molding, the process of forming an article by first applying a liquid resin (sometimes a special gel coat) to the mold surface, then applying a reinforcing backing layer with more resin. 

Designing with Fiberglas Reinforced Plastics, Molded Fiberglas Company, Ashtabula, Ohio, 1989. 

An exttemely smooth surface can be obtained on a reinforced plastic molding by placing a thin overlay sheet on the exposed surface of the composite. This type of mat provides little actual reinforcement. It does, however, facilitates a resin-rich surface layer to be incorporated into the molded part. 

A variation of RIM is reinforced reaction injection molding (RRIM). RRIM refers to a molding process in which the resin is pumped into a closed mold that has been preloaded with dry reinforcements. Polyester resins are often used, but polyurethanes, vinyl esters, and epoxies can be molded via RIM. The advantages of RIM over other reinforced plastic molding processes are ... 

The leno weave is a locking-type weave in which two or more warp threads cross over each other and interlace with one or more filling threads. It is used primarily to prevent the shifting of fibers in open-weave fabric designs. It is especially useful when the fabric will be exposed to the pressures of a flowing resin during the reinforced plastic molding operation. 

---